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Misfiring at high boost+RPMs

Old 10-05-2005, 11:52 PM
  #3  
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Default Re: Misfiring at high boost+RPMs

Check your grounds and your plug gap...ignitor might be on its way out too.
Chris Harris is offline  
Old 10-06-2005, 01:31 AM
  #4  
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Default Re: Misfiring at high boost+RPMs

I have a similar problem with my new setup but its mainly cause once I hit 10lbs it gets insanels rich, goes from 12 to 1 to nearly 9 to 1 in 2000rpm I would just run some cheap *** copper plugs, thats what I'm running and they work great. I would think if your base timing is off than it would have issues at lower rpms as well as lower boost levels. I would look at the map sensor you may be overloading it.
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Old 10-06-2005, 02:51 AM
  #5  
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Default Re: Misfiring at high boost+RPMs

put some fresh plugs in and slam the gap down to like .025 or something rediculous. If I fixes it, keep working your gap back up. For 9-10psi though, stock gap sould give you no problems. Do you have a spare set of plug wires your can toss on? Old old *** plug wires can easily do what you describe when in boost (the more boost, the harder it is to jump the gap, and if there is any weak spot in the ingnition path, it will jump there)

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Old 10-06-2005, 03:01 AM
  #6  
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Default Re: Misfiring at high boost+RPMs

whats your timing map look like in that area? i bet there isnt enough timing....
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Old 10-06-2005, 12:48 PM
  #8  
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Default Re: Misfiring at high boost+RPMs

sounds like ignition.

i had a t3/t4 setup with a z6 in a crx that i tuned a while back. at 10psi it started cracklinup on me.

gapped to 028 and all was happy.

try some new plugs, inspect your cap/rotor.
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Old 10-06-2005, 01:34 PM
  #10  
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Join Date: Apr 2003
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Default Re: Misfiring at high boost+RPMs

it's not your map sensor, i've boosted well over 11.xx psi on stock map sensor many times. timing in your maps looks fine, don't see any sudden changes or anything that should cause a sudden loss of power. my guess would have to be plugs/wires, i too have had some problems with shitty/old wires causing misfires at certain times.
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